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345 ADOBE PREMIERE 5.0
User Guide
oriented, and D-1 pixels in systems producing PAL video are horizontally oriented. If you
display D-1 format on a non-D-1 monitor without modification, the 720-by-486 pixel
resolution does not produce a 4:3 aspect ratio. Shapes and motion appear stretched; for
example, circles are distorted into ellipses.
A 4:3 aspect ratio frame with square pixels (left), a 4:3 aspect ratio with tall horizontal pixels (center),
and the center frame displayed using square pixels (right).
For more information about aspect ratio options, see “Maintaining the original aspect ratio
of a clip” on page 164.
Frame size
In Premiere, you specify a frame size for playing back video from the Timeline (see “Video
settings” on page 61) and if necessary, for exporting video to a file (“About output settings”
on page 297). Frame size is expressed by the horizontal and vertical dimensions of a frame in
pixels. As you increase frame dimensions, you increase the number of pixels Premiere must
process for each frame. For example, a 640-by-480 pixel frame contains 307,200 pixels, while
a 720-by-486 image contains 349,920 pixels.
The frame size you specify is determined by the video output format to which your program
will be played back or exported. For example, you might specify a frame size of 640-by-480
pixels for NTSC video or 720-by-576 pixels for PAL video. Or you might specify a frame size
of 160-by-120 pixels to help create a small file size that downloads efficiently over the World
Wide Web. Increasing resolution also increases memory and processing requirements, so you
might decide to specify a smaller frame size for previewing edits than you would for playing
back or exporting the final cut.
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